Abstract
Summary The effect of dietary changes and associative changes in ruminal microorganisms on volatile fatty acid (VFA) formation from C 14 -labeled polysaccharides was investigated. Cellulose-C 14 and hemicellulose-C 14 , isolated from orchard grass grown under a C 14 O 2 atmosphere, were incubated 4 hr with rumen ingesta obtained from a fistulated cow fed either alfalfa hay (H) or a 2.5:1 grain-alfalfa hay mixture (G). With cellulose-C 14 as the substrate, the molar acetate-C 14 :propionate-C 14 ratio with ingesta H was significantly greater (P 14 were also significantly greater (P 14 formed by way of the randomizing route, involving a four-carbon intermediate which is subsequently decarboxylated, ranged from 92% for ingesta H with cellulose to 77% for ingesta G with hemicellulose. There was an indication that the randomizing route of propionate formation was more important with ingesta H than with ingesta G.
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